The event at London's XOYO on December 12 will raise money to support the fight against suicide in young men.
Cheatahs will also perform alongside some 'special secret live guests'.
Beyond The Wizard's Sleeve (Erol Alkan), Chapel Club, Ben Cornershop, Trailer Trash Tracys, Charlie Bones (NTS), Sexbeat and The Holy Trinity DJ will play music throughout the evening. Comedian and broadcaster Mat Horne will host.
The event will be held in memory of Adam Connolly, a friend of Friendly Fires who took his own life.
"Perhaps it sounds a tad predictable in these kind of circumstances but we wanted to do something that celebrates Adam's life, his amazing creativity, and his beautiful warm, kind soul as well as showing how much we deeply love and miss him," reads the Facebook post.
Watch the video for 'Why Don't You Answer?', which Friendly Fires debuted earlier this week, below: